Youtube - Live Events and Hangouts on Air

What is the best way to live stream on Youtube?
Each of these streaming options has it's own approach to viewers and producers.

Hangouts on Air is now prepped to be the home for Google Voice as well.
More specifically, if you want to use Google Voice a Google + account will be required along with hangouts.
Hangouts and Hangouts on Air also require a Google+ account.

I've not been reviewing "youtube live events" for new tie ins to other Google services, but I imagine they are in the works.

Youtube is the big daddy or king daddy if you want your videos viewed.
Afterall, Google and Youtube are the number one and number two search engines respectively.
So, you can't get better results to bring viewers to your videos unless you are very SEO savvy.

The live events and hangouts leave me cold, yet I'm thinking one or the other has gotta be used for promotion of videos.
The Hangouts on Air I've observed are usually just a couple of like minded people talking unceasingly with some information of value laced into their chit chat. Mostly, I get bored when I watch Hangouts, and have to drink strong black coffee to stay awake.

Maybe some others reading this could jibe in and share some constructive information about one or the other of the youtube live stream options.